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TABLE -4-1 <br /> Potential Petroleum Contaminants and Exposure Limits <br /> Compound OSHA-PEL TLV-TWA TLV-STEL REL ppm Odor threshold Odor Characteristic <br /> ppm ppm ppm valves, ppm <br /> Benzene 1 10 5 0.1 3.9 =made.sett <br /> (Ca) <br /> Toluene 100 100 150 100+ 39 .vett.pungent <br /> Xylene 100 100 150 IOOk I30 aromatic.Beet <br /> PEL -OSHA Personnel E<posure Limit. <br /> TLV -ACGIH Threshold Limit Values. <br /> TWA -Time Weighted Average. <br /> STEL •Short Term Exposure Limit. <br /> REL -NIOSH Recommended Exposure Limit. <br /> Ca •Suspected carcinogen. 1938-89 ACGIH TLV. <br /> d -60 minute ceiling. 10 hour TWA.200 ppm 10 minute ceiling. <br />